Weak Authentication Affecting laravel/passport package, versions >=13.0.0, <13.7.1
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applications- Snyk IDSNYK-PHP-LARAVELPASSPORT-15965921
- published10 Apr 2026
- disclosed9 Apr 2026
- creditUnknown
Introduced: 9 Apr 2026
CVE-2026-39976 (opens in a new tab)How to fix?
Upgrade laravel/passport to version 13.7.1 or higher.
Overview
Affected versions of this package are vulnerable to Weak Authentication due to improper validation of oauth_user_id in the TokenGuard::authenticateViaBearerToken() function. An attacker can gain unauthorized access to unrelated user accounts by presenting a machine-to-machine token with a client identifier that is incorrectly interpreted as a user identifier.